Wireless Fidelity.  Short for wireless fidelity.  It is a wireless technology that uses radio frequency to transmit data through the air.  Wi-Fi is.

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Presentation on theme: "Wireless Fidelity.  Short for wireless fidelity.  It is a wireless technology that uses radio frequency to transmit data through the air.  Wi-Fi is."— Presentation transcript:

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Wireless Fidelity

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 Short for wireless fidelity.  It is a wireless technology that uses radio frequency to transmit data through the air.  Wi-Fi is based on the standard: ◦ a ◦ b ◦ g

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 IEEE (Institute of Electrical and Electronics Engineers) established the Group in Specifications for standard written in  Initial speeds were 1 and 2 Mbps.  IEEE modified the standard in 1999 to include: ◦ b ◦ a ◦ g was added in  IEEE created standard, but Wi-Fi Alliance certifies products

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 Well-supported, stable, and cost effective, but runs in the 2.4 GHz range that makes it prone to interference from other devices (microwave ovens, cordless phones, etc) and also has security disadvantages.  Limits the number of access points in range of each other to three.  Has 11 channels, with 3 non-overlapping, and supports rates from 1 to 11 Mbps, but realistically about 4-5 Mbps max.  Uses direct-sequence spread-spectrum technology.

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 Extension of b, with the same disadvantages (security and interference).  Has a shorter range than b.  Is backwards compatible with b so it allows or a smooth transition from 11b to 11g.  Flexible, because multiple channels can be combined for faster throughput, but limited to one access point.  Runs at 54 Mbps, but realistically about Mbps and about 14 Mbps when b associated  Uses frequency division multiplexing

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 Completely different from 11b and 11g.  Flexible, because multiple channels can be combined for faster throughput and more access points can be co-located.  Shorter range than 11b and 11g.  Runs in the 5 GHz range, so less interference from other devices.  Has 12 channels, 8 non-overlapping, and supports rates from 6 to 54 Mbps, but realistically about 27 Mbps max  Uses frequency division multiplexing

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 Block your Service Set Identifier (SSID) from being broadcast.  Change the default network name in the access point.  Change the default access point password.  Center the access point in the middle of the building/house.

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 Every network device has a unique MAC address ◦ Allocated by the manufacturer.  MAC Filtering only allows certain addresses access.  Mostly for home use. ◦ Tedious to implement on a large scale

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 Designed to replace WEP. ◦ 128-bit Advanced Encryption Standard (AES).  Based on the IEEE i standard.  Provides government level security.  Also available in two versions: ◦ WPA2 Personal. ◦ WPA2 Enterprise.

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 Creates a secure virtual “tunnel” from remote device to VPN server. ◦ Creates an encryption scheme. ◦ Requires authentication.  Works across the internet.  Many types and levels of VPN technology. ◦ May include hardware and software components. ◦ Some very expensive. ◦ Windows provides a basic implementation in its server software.